Resources Contact Us Home
Frost-resistant year-round heat pump

Image Number 2 for United States Patent #4596123.

This invention is an improved refrigerant-cycle heat pump that requires neither a defrosting means nor a backup heat source. From widely varying outside environments, it pumps heat to heat living spaces or domestic hot water. Liquid refrigerant flows from a receiver through expansion valves into an outside evaporator consisting of a segmented array of plates where heat is absorbed from the atmosphere to evaporate the refrigerant. The resultant gas is compressed by a motor-driven compressor, gives up heat in a condenser, becomes liquid, and returns to the receiver. The segmented evaporator enables the self-governing heat pump system to choose the proper magnitude of evaporator area, in response to its determination of compressor suction pressure or motor power demand, so as to provide a steady refrigerant flow to the compressor and thereby maintain optimum heat pumping despite extreme excursions of outside temperature. The configuration of evaporator segments as plates enables the system to operate without interruption or performance deterioration even though frost or ice forms on plate surfaces.

  Recently Added Patents
Wireless communication system, wireless communication device, wireless communication method, and program
Methods of measuring cell viability in tissue engineered products
Semiconductor device and manufacturing method thereof
Chain link
Chemically bonded carbon nanotube-polymer hybrid and nanocomposite thereof
Pixel structure of a solid-state image sensor employing a charge sorting method
Apparatus and method for transmitting and receiving data streams in wireless system
  Randomly Featured Patents
Water pump
Photonic crystal light emitting device using photon-recycling
Polyamide composition
Aquatic weed cutter, de-rooter and harvester
Method and apparatus for forming threads on a sleeve inner wall
Modem to support multiple site call conferenced data communications
Method and apparatus for locating critical speed paths in integrated circuits using a clock driver circuit with variable delay
Brassiere construction
Assembly for supporting and displaying objects
Liquid jet head, liquid jet apparatus, and manufacturing method for the liquid jet head